EP0342544A1 - Agent contre le virus du SIDA - Google Patents

Agent contre le virus du SIDA Download PDF

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Publication number
EP0342544A1
EP0342544A1 EP89108599A EP89108599A EP0342544A1 EP 0342544 A1 EP0342544 A1 EP 0342544A1 EP 89108599 A EP89108599 A EP 89108599A EP 89108599 A EP89108599 A EP 89108599A EP 0342544 A1 EP0342544 A1 EP 0342544A1
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Prior art keywords
polysaccharide
sulfate
aids virus
activities
schizophylan
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EP89108599A
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German (de)
English (en)
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EP0342544B1 (fr
Inventor
Shigero Mori
Isamu Sugawara
Wataru Ito
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Taito Co Ltd
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Taito Co Ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/715—Polysaccharides, i.e. having more than five saccharide radicals attached to each other by glycosidic linkages; Derivatives thereof, e.g. ethers, esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/715—Polysaccharides, i.e. having more than five saccharide radicals attached to each other by glycosidic linkages; Derivatives thereof, e.g. ethers, esters
    • A61K31/716—Glucans
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
    • C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
    • C08B37/0024—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
    • C08L5/02—Dextran; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/99—Enzyme inactivation by chemical treatment

Definitions

  • the present invention relates to an anti-AIDS virus agent. More particularly, it relates to an anti-AIDS virus agent comprising a sulfate of a polysaccharide as an active ingredient.
  • AIDS immunodeficiency syndrome
  • HIV human immunodeficiency virus
  • helper T cells are mainly destroyed.
  • abnormality appears over the entire T cells or abnormality of B cells results, thus leading to immunological deficiency.
  • opportunistic infection malignant tumors such as Kaposi sarcoma or cerebral lymphoma, central nerve system and organ disorders will be brought about, and it is a dangerous disease which eventually leads to death.
  • AZT azidothymidine
  • dideoxycytidine dideoxyadenosine
  • suramin dideoxyadenosine
  • ribavirin HPA-23 and interferon
  • AZT has an activity to inhibit the reverse transcriptase of AIDS virus, and its use has been approved in U.S.A., since its usefulness to AIDS patients has been proved.
  • nucleoside-related substances including AZT have side effects and tend to lead to bone marrow disorders, macrocytic anemia, gastrointestinal disorders or lesions. No practical usefulness has been confirmed with suramin, ribavirin and HPA-23.
  • polysaccharide SAE derived from Floridephyceae has an activity to inhibit the reverse transcriptase of AIDS virus.
  • polysaccharide sulfates derived from natural substances such as ⁇ , ⁇ or -caragenan, heparin or chondroitin sulfate, have similar physiological activities.
  • the present inventors have sulfated some homopolysaccharides and compared their anti-AIDS virus activites, whereby it has been found that dextran sulfate has stronger activities than the sulfates of e.g. mannan, pullulan and alginic acid.
  • the present inventors have conducted further experiments on the anti-AIDS virus activities of other homopolysaccharide sulfates, and found that sulfates of polysaccharides consisting of the repeating unit represented by the formula (1) exhibit even stronger anti-AIDS virus activities than the dextran sulfate. They have further conducted tests on the effects of the molecular weight and the sulfate content of sulfates of the polysaccharides of the repeating unit of (1) over the anti-AIDS virus activities and have finally accomplished the present invention.
  • the present invention provides an anti-AIDS virus agent comprising a sulfate of a polysaccharide having repeating units of the formula: and having a molecular weight of at most 1,000,000 (n ⁇ 1544).
  • the present invention also provides use of a sulfate of a polysaccharide having repeating units of the formula (1) and having a molecular weight of at most 1,000,000 (n ⁇ 1544) for the manufacture of an anti-AIDS virus agent.
  • schizophylan produced by Schizophyllum commune Fries schizophylan produced by Schizophyllum commune Fries
  • scleroglucan produced by Sclerotium glucanicum scleroglucan produced by Sclerotium glucanicum
  • pendulan produced by Porodisculus pendulus Since these homopolysaccharides can be extracellularly produced by culturing the respective strains, the separation and purification of the polysaccharides are easy.
  • the polysaccharide obtained by such culturing forms an extremely viscous and thixotropic aqueous solution, and its purification is usually difficult.
  • Such depolymerization may preferably be conducted by irradiating ultrasonic waves to the aqueous polysaccharide solution or treating such polysaccharide solution with a high shear force.
  • the molecular weight of the polysaccharide is preferably lowered to a level of at most 10 ⁇ 6 (n in the formula (1) being at most 1544), preferably at most 5 x 105 (n in the formula (1) being at most 772). If the molecular weight of the polysaccharide exceeds the above limit, it becomes difficult to conduct a purification operation such as filtration, ion exchange or active carbon treatment, since the aqueous solution will be highly viscous.
  • the polysaccharide used in the present invention is a polysaccharide containing ⁇ -1,3-linked backbone chain. Therefore, as opposed to polysaccharides having ⁇ -­glucoside bonds, such as starch or dextran, it is scarcely decomposed by an enzyme in the living body and has a very low toxicity as its feature.
  • the sulfation may be conducted by any one of known methods. For example, it is possible to employ a method wherein sulfuric acid is used, a method wherein chlorosulfonic acid is used, or a method wherein sulfate trioxide is used. Among these methods, the chlorosulfonic acid method and the sulfate trioxide method employed in combination with a Lewis base, are particularly suitable for the prepration of the polysaccharide sulfate of the present invention, since the decomposition of the polysaccharide is thereby less than the method wherein sulfuric acid is used.
  • pyridine triethylamine, trimethylamine, dioxane or bis(2-­chloroethyl) ether
  • a simplified method it is possible to employ a sulfation method wherein a pyridine/sulfuric anhydride complex is reacted with the polysaccharide in pyridine or dimethylsulfoxide.
  • the prepared polysaccharide sulfate is usually kept in the form of a suitable salt in order to prevent it from hydrolysis.
  • a suitable salt for example, an ammonium salt or an alkali metal salt such as a sodium salt is common.
  • an alkaline earth metal salt, a metal salt such as an iron salt, or a salt with a quarternary amine, may also be employed.
  • the polysaccharide and its sulfate have the following infrared absorption spectra.
  • the present inventors have studied the correlation of the mitogenic or the anti-AIDS activities with the average molecular weight of the polysaccharide as the starting material used for the preparation of the polysaccharide sulfate or the sulfur content after the sulfation and the mitogenic activities or the anti-AIDS virus activities. As a result, it has been found that these physiological activities depend largely on the sulfur content after the sulfation rather than on the average molecular weight of the polysaccharide. Significant mitogenic activities are discernible at a sulfur content of the polysaccharide sulfate ranging from 2 to 17% by weight, and the anti-AIDS virus activities are obtainable at a sulfur content ranging from 3 to 17% by weight.
  • the sulfur content is less than 3% by weight, the anti-AIDS virus activities tend to be low.
  • the cell toxicity tests of schizophylan sulfate having a sulfur content of 17% by weight no cell toxicity was observed up to a concentration of 2,000 ⁇ g/ml.
  • the sulfur content is higher than this level, the product is believed to be unsuitable as a drug.
  • the molecular weight of the polysaccharide to be used in the present invention may be at any level within a range suitable for adequate purification and is usually at most 106 (n of the formula (1) being at most 1,544), preferably at most 5 x 105 (n of the formula (1) being at most 772).
  • sulfates of other polysaccharides such as dextran, curdran and lentinan also have anti-AIDS virus activities at a sulfur content within substantially the same range as the above discovery with respect to schizophylan.
  • a discovery is irrelevant to the present invention.
  • a sulfate of the polysaccharide was prepared by various methods, and its mitogenic activities and anti-­ AIDS virus activities were investigated.
  • a pyridine/sulfuric anhydride complex (from 2 to 6 g) was added thereto. The mixture was reacted under stirring at a temperature of from 60 to 70°C for sulfation.
  • the precipitate was dissolved in a small amount of water, and free sulfuric acid was removed by centrifugation after converted to barium sulfate. The supernatant was concentrated under reduced pressure, and an excess amount of ethanol was added thereto to obtain a precipitate of a sulfate.
  • the precipitate was dissolved in water for ion exchange treatment and then neutralized with NaOH. After concentration, ethanol was added to form a precipitate. The precipitate was collected by centrifugal separation, then dissolved in a small amount of water and freeze-­dried to obtain schizophylan sulfate (1) to (3) and (7) to (10).
  • schizophylan 1 g was dissolved in 100 ml of dimethyl sulfoxide, and 3 g, 6 g or 9 g of a pyridine/sulfuric anhydride complex was added thereto. The mixture was reacted at room temperature for 5 minutes for sulfation.
  • the reaction solution was cooled with ice water. After removing the supernatant, the precipitate was dissolved by an addition of 50 ml of cold water thereto. The solution was neutralized by an addition of a saturated barium hydroxide aqueous solution. After removing the precipitate by centrifugation, the supernatant was subjected to dialysis. The non-dialyzate was concentrated under reduced pressure. An excess amount of acetone was added thereto, followed by centrifugation. The precipitate thereby obtained was dissolved in 50 ml of water for ion exchange treatment, then neutralized by an addition of 1N NaOH and freeze-dried to obtain schizophylan sulfate (4) to (6).
  • Table 1 Polysaccharide used for reaction Yield of its sulfate (g) Sulfur content (wt%) Sample No. Average Molecular weight Weight (g) 1.0 0.25 1.96 (1) 1.0 0.81 3.84 (2) 45.5 x 104 1.0 1.0 13.7 (3) 1.0 0.92 4.63 (4) 1.0 0.92 7.07 (5) 1.0 1.00 17.1 (6) 0.5 0.45 3.70 (7) 11.5 x 104 0.5 0.74 4.20 (8) 0.5 0.52 7.20 (9) 0.5 0.45 10.7 (10) 3.10 x 104 1.0 0.87 9.70 (11) 1.15 x 104 1.0 0.56 10.0 (12)
  • a spleen of a mouse was aseptically taken out and dispersed in a culture medium to obtain a cell suspension containing 3 x 106 cells/ml.
  • the cells were subdivided into wells of a 96 well-microplate so as to adjust the cell number in each well to 3 x 105.
  • a culture medium and a sample were added to each well, followed by culturing for 3 days.
  • 0.5 ⁇ Ci of 3H-­thymidine was added to each well, and culturing was conducted for further 7 hours. Then, the cells were harvested and thoroughly washed, and the amount of 3H thymidine taken into the cells was measured by a liquid scintillation counter.
  • Schizophylan sulfates exhibited high mitogenic activities which were not observed in the case of schizophylan.
  • Virus derived from Tall-1/HTLV-III were adsorbed on Molt-4/cl. No. 8 cells. Then, the cells were washed with a culture medium to remove virus not adsorbed on the cells. The cells thus obtained were subjected to the following test.
  • a cell suspension containing 3.5 x 104 cells/ml 1 ml of a culture medium and a sample dissolved in PBS were added so that the final concentration of the sample would be 100 ⁇ g/ml. Culturing was conducted for 8 days, and cytopathic effects (CPE) by virus were observed. Further, on the 8th day, the supernatant of the culture medium was sampled and subjected to the measurement of reverse transcriptase activities. The cells were subjected to an indirect immunofluorescence assay to detect the virus antigen.
  • CPE cytopathic effects
  • schizophylan sulfates have strong anti-AIDS virus activities for distinctly suppressing proliferation of AIDS virus.
  • anti-AIDS virus activities of schizophylan sulfates were studied by using MT-4 cells.
  • Cells were prepared in the same manner as in Example 1(3), and into each well, 1 ml of a cell suspension containing 14 x 104 cells/ml, 1 ml of a culture medium and a sample solution were added, followed by culturing for 10 days.
  • the anti-AIDS virus activities of schizophylan sulfates were studied by the observation of the cytopathic effects, by the measurement of reverse transcriptase activities and by the indirect immunofluorescence assay.
  • schizophylan sulfates exhibited strong anti-AIDS virus activities also in a cell-line such as MT-4 cell which is highly sensitive to AIDS virus.
  • Lymphocytes were separated from peripheral blood of an AIDS patient by Ficoll-Paque Separation, washed three times with a serum-free culture medium and suspended in a culture medium containing 10% of FCS. Adsorbable cells were removed, and suspended cells were collected and suspended in a culture medium. Then, PHA and IL-2 were added thereto. Healthy human lymphocytes were prepared 3 days ahead by the above-mentioned method. Into each well of a microplate having 24 wells, 106/1 ml of patient's lymphocytes, a culture medium, 106/1 ml of healthy human lymphocytes and a schizophylan sulfate solution were introduced, mixed and cultured.
  • the supernatant was sampled and subjected to the measurement of reverse transcriptase activities. Into each well, a sampled supernatant and the same amount of a culture medium were introduced and culturing was continued.
  • Schizophylan is a polysaccharide having anti-tumor activities. Such activities may sometimes remain even after sulfation, and thus provides a feature which can not be found in other anti-AIDS virus agents.
  • mice Each group consisted of 6 mice. To the control grcup, PES was administered in the same amount as in the tested group.
  • results of an acute toxicity test are shown in Table 7.
  • Table 7 Acute toxicity test of schizopylan sulfates Molecular weight of schizophylan: 45.5 x 104; sulfur content: 10.7 wt% LD50 Molecular weight of schizophylan: 45.5 x 104; sulfur content: 18.1 wt% LD50
  • Oral administration At least 4,000mg/kg At least 4,000mg/kg
  • Subcutaneous injection At least 500mg/kg At least 100mg/kg Intramuscular injection At least 500mg/kg At least 50mg/kg Intravenous injection At least 200mg/kg At least 50mg/kg Intraperitoneal injection At least 500mg/kg At least 50mg/kg
  • Ultrasonic waves were irradiated to aqueous solutions of scleroglucan and pendulan, which are polysaccharides composed of repeating units of the formula (1) like schizophylan, to adjust the respective molecular weights to a level of 400,000. Then, they were sulfated in accordance with method A in Example 1 (polysaccharide: 0.5 g; pyridine/ sulfuric anhydride complex: 5 g; reaction time: 5 hours) to obtain polysaccharide sulfates.
  • the anti-AIDS virus activities were studied with respect to the sulfates of scleroglucan and pendulan thus obtained, in accordance with the method as used in Example 1(3).
  • Example (3) As the control, schizophylan sulfate (sample (3)) in Example 1 and dextran sulfate were used. The results are shown in Table 8. Table 8 Anti-AIDS virus activities of sulfates of scleroglucan and pendulan Reverse transcriptase activities (CPM) Sample Sample concentration 100 ⁇ g/ml 500 ⁇ g/ml Scleroglucan sulfate 669 ⁇ 42 723 ⁇ 26 Pendulan sulfate 646 ⁇ 50 515 ⁇ 83 Schizophylan sulfate 739 ⁇ 67 634 ⁇ 37 Dextran sulfate 1781 ⁇ 169 923 ⁇ 32 Control: Virus (-) 621 ⁇ 47 Virus (+) 51344 ⁇ 2355
  • the sulfates of scleroglucan and pendulan exhibited stronger AIDS-virus proliferation-­suppressing activities than the dextran sulfate, like schizophylan sulfate. Further, these sulfates completely suppressed formation of giant cells which were otherwise likely to be caused by cytophatic effects.
  • Table 9 The dependency of the anti-AIDS virus activities on the molecular weight of the polysaccharide Reverse transcriptase activities (CPM) Molecular weight of schizophylan Sulfur content (wt%) Sample concentration 100 ⁇ g/ml 500 ⁇ g/ml 1.1 x 106 9.3 705 ⁇ 57 667 ⁇ 42 7.6 x 105 11.7 632 ⁇ 48 612 ⁇ 43 45.5 x 105 13.7 693 ⁇ 52 680 ⁇ 50 3.2 x 10 7.9 445 ⁇ 66 490 ⁇ 58 Dextran sulfate 13.0 1738 ⁇ 251 923 ⁇ 87 Control: Virus (-) 854 ⁇ 53 Virus (+) 49291 ⁇ 2035
  • the anti-AIDS virus agent of the present invention comprises a polysaccharide sulfate which is prepared by sulfation of a homopolysaccharide consisting solely of glucose, resulting in its very potent anti-AIDS activity as well as the potent mitogenic activity in comparison with those of other sulfated polysaccharides. Further, the polysaccharide sulfate of the present invention has a sulfur content of from 3 to 17%, whereby it has a feature that it has a low toxicity while having strong anti-AIDS virus activities.
  • the anti-AIDS virus agent of the present invention has the anti-AIDS virus activities not only in a subcultured cell-line such as Molt-4/cl. No. 8 cells or MT-4 cells, but also in a human peripheral lymphocytes. This indicates that the polysaccharide sulfate of the present invention can be an excellent anti-AIDS virus agent.
  • the average molecular weight of the polysaccharide of the present invention is adjusted to be from 10,000 to 500,000, whereby various problems involved in the process for the production such as filtration and purification, can be solved, and a highly purified polysaccharide can be obtained. Accordingly, the anti-­AIDS virus agent of the present invention can have a high quality as a drug.

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EP89108599A 1988-05-13 1989-05-12 Agent contre le virus du SIDA Expired - Lifetime EP0342544B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63116499A JP2681653B2 (ja) 1988-05-13 1988-05-13 抗エイズウィルス剤
JP116499/88 1988-05-13

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EP0342544A1 true EP0342544A1 (fr) 1989-11-23
EP0342544B1 EP0342544B1 (fr) 1993-11-10

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EP0375174A2 (fr) * 1988-11-28 1990-06-27 Ajinomoto Co., Inc. Sulphates de lentinane et de curdlane à usage antiviral
EP0450792A2 (fr) * 1990-04-05 1991-10-09 Cerestar Holding Bv Glomérellan comme agent immunostimulant et/ou anticancéreux
EP0532026A2 (fr) * 1991-09-13 1993-03-17 Dainippon Ink And Chemicals, Inc. Sulfate d'oligosaccharide glycoside aromatique
US5272261A (en) * 1989-01-11 1993-12-21 Merrell Dow Pharmaceuticals Inc. Preparation of sulfated polysaccharide fractions
CN1067405C (zh) * 1998-04-24 2001-06-20 华中理工大学 硫酸酯化箬叶多糖及其制备方法
EP1534303A1 (fr) * 2002-08-13 2005-06-01 Monash University Polymeres charges d'agents antimicrobiens presentant une resistance a la degradation lysosomiale lors de la filtration et du passage renaux, compositions et procede d'utilisation

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AU620218B2 (en) * 1989-02-10 1992-02-13 Taiho Pharmaceutical Co., Ltd. Anti-hiv drug
JP2911554B2 (ja) * 1990-06-25 1999-06-23 台糖株式会社 抗ウィルス剤
US5573589A (en) * 1993-03-10 1996-11-12 Sandoz Ltd. Cement compositions containing a sulfated polysaccharide and method
KR20010113435A (ko) * 2000-06-16 2001-12-28 야기타 카즈코 암치료제
US20040009953A1 (en) * 2002-01-10 2004-01-15 Comper Wayne D. Antimicrobial charged polymers that exhibit resistance to lysosomal degradation during kidney filtration and renal passage, compositions and method of use thereof
GB0225197D0 (en) * 2002-10-30 2002-12-11 Univ Sheffield Surface
US20050009782A1 (en) * 2003-07-09 2005-01-13 Comper Wayne D. Antiviral charged polymers that exhibit resistance to lysosomal degradation during kidney filtration and renal passage, compositions and methods of use thereof
CN114014948B (zh) * 2021-11-03 2023-01-06 华南理工大学 硫酸酯化裂褶多糖及其制备方法及其在化妆品中的应用

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EP0293826A3 (fr) * 1987-06-02 1989-05-10 Stichting REGA V.Z.W. Application thérapeutique et prophylactique des polysaccharides sulfatés contre le SIDA

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US4590181A (en) * 1982-12-20 1986-05-20 Board Of Regents Of The University Of Nebraska Synthetic immunoregulators and methods of use and preparation
EP0240098A2 (fr) * 1986-04-04 1987-10-07 Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo Oligo et Polysaccharides pour le traitement des maladies causées par des rétrovirus

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Agric. Biol. Chem., Vol. 50, No. 6, 1986, pages 1635-1636; T. KOJIMA et al.: "Biological activity of sulfated schizophyllan", whole article. *
Antimicrobial Agents and Chemotherapy, Vol. 31, No. 10, October 1987, pages 1524-1528, American Society for Microbiology, US; H. NAKASHIMA et al.: "Purification and characterization of an avian myeloblastosis and human immunodeficiency virus reverse transcriptase inhibitor, sulfated polysaccharides extracted from sea algae", whole article, especially page 1528. *
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0375174A2 (fr) * 1988-11-28 1990-06-27 Ajinomoto Co., Inc. Sulphates de lentinane et de curdlane à usage antiviral
EP0375174A3 (fr) * 1988-11-28 1990-12-19 Ajinomoto Co., Inc. Sulphates de lentinane et de curdlane à usage antiviral
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EP0450792A3 (en) * 1990-04-05 1992-10-14 Cerestar Holding Bv Glomerellan as an immunostimulant and/or an anti-tumor agent
EP0532026A2 (fr) * 1991-09-13 1993-03-17 Dainippon Ink And Chemicals, Inc. Sulfate d'oligosaccharide glycoside aromatique
EP0532026A3 (en) * 1991-09-13 1993-10-06 Dainippon Ink And Chemicals, Inc. Oligosaccharide aromatic glycoside sulfate
US5498602A (en) * 1991-09-13 1996-03-12 Dainippon Ink And Chemicals, Inc. Oligosaccharide aromatic glycoside and sulfate thereof
CN1067405C (zh) * 1998-04-24 2001-06-20 华中理工大学 硫酸酯化箬叶多糖及其制备方法
EP1534303A1 (fr) * 2002-08-13 2005-06-01 Monash University Polymeres charges d'agents antimicrobiens presentant une resistance a la degradation lysosomiale lors de la filtration et du passage renaux, compositions et procede d'utilisation
EP1534303A4 (fr) * 2002-08-13 2008-03-19 Univ Monash Polymeres charges d'agents antimicrobiens presentant une resistance a la degradation lysosomiale lors de la filtration et du passage renaux, compositions et procede d'utilisation

Also Published As

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DE68910577D1 (de) 1993-12-16
DE68910577T2 (de) 1994-06-01
JP2681653B2 (ja) 1997-11-26
JPH01287031A (ja) 1989-11-17
US5053398A (en) 1991-10-01
EP0342544B1 (fr) 1993-11-10

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